content/renderer/render_thread_impl.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
   6 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
   7
   8 #include <set>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/memory/memory_pressure_listener.h"
  13 #include "base/metrics/user_metrics_action.h"
  14 #include "base/observer_list.h"
  15 #include "base/strings/string16.h"
  16 #include "base/threading/thread_checker.h"
  17 #include "base/timer/timer.h"
  18 #include "build/build_config.h"
  19 #include "content/child/child_thread.h"
  20 #include "content/common/content_export.h"
  21 #include "content/common/gpu/client/gpu_channel_host.h"
  22 #include "content/public/renderer/render_thread.h"
  23 #include "net/base/network_change_notifier.h"
  24 #include "third_party/WebKit/public/platform/WebConnectionType.h"
  25 #include "ui/gfx/native_widget_types.h"
  26
  27 #if defined(OS_MACOSX)
  28 #include "third_party/WebKit/public/web/mac/WebScrollbarTheme.h"
  29 #endif
  30
  31 class GrContext;
  32 class SkBitmap;
  33 struct ViewMsg_New_Params;
  34 struct WorkerProcessMsg_CreateWorker_Params;
  35
  36 namespace blink {
  37 class WebGamepads;
  38 class WebGamepadListener;
  39 class WebGraphicsContext3D;
  40 class WebMediaStreamCenter;
  41 class WebMediaStreamCenterClient;
  42 }
  43
  44 namespace base {
  45 class MessageLoopProxy;
  46 class Thread;
  47 }
  48
  49 namespace cc {
  50 class ContextProvider;
  51 }
  52
  53 namespace IPC {
  54 class ForwardingMessageFilter;
  55 class MessageFilter;
  56 }
  57
  58 namespace media {
  59 class AudioHardwareConfig;
  60 class GpuVideoAcceleratorFactories;
  61 }
  62
  63 namespace v8 {
  64 class Extension;
  65 }
  66
  67 namespace webkit {
  68 namespace gpu {
  69 class ContextProviderWebContext;
  70 class GrContextForWebGraphicsContext3D;
  71 }
  72 }
  73
  74 namespace content {
  75
  76 class AppCacheDispatcher;
  77 class AudioInputMessageFilter;
  78 class AudioMessageFilter;
  79 class AudioRendererMixerManager;
  80 class ContextProviderCommandBuffer;
  81 class DBMessageFilter;
  82 class DevToolsAgentFilter;
  83 class DomStorageDispatcher;
  84 class EmbeddedWorkerDispatcher;
  85 class GamepadSharedMemoryReader;
  86 class GpuChannelHost;
  87 class IndexedDBDispatcher;
  88 class InputEventFilter;
  89 class InputHandlerManager;
  90 class MediaStreamCenter;
  91 class PeerConnectionDependencyFactory;
  92 class MidiMessageFilter;
  93 class NetInfoDispatcher;
  94 class P2PSocketDispatcher;
  95 class PeerConnectionTracker;
  96 class RendererDemuxerAndroid;
  97 class RendererWebKitPlatformSupportImpl;
  98 class RenderProcessObserver;
  99 class VideoCaptureImplManager;
 100 class WebGraphicsContext3DCommandBufferImpl;
 101 class WebRTCIdentityService;
 102
 103 // The RenderThreadImpl class represents a background thread where RenderView
 104 // instances live.  The RenderThread supports an API that is used by its
 105 // consumer to talk indirectly to the RenderViews and supporting objects.
 106 // Likewise, it provides an API for the RenderViews to talk back to the main
 107 // process (i.e., their corresponding WebContentsImpl).
 108 //
 109 // Most of the communication occurs in the form of IPC messages.  They are
 110 // routed to the RenderThread according to the routing IDs of the messages.
 111 // The routing IDs correspond to RenderView instances.
 112 class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
 113                                         public ChildThread,
 114                                         public GpuChannelHostFactory {
 115  public:
 116   static RenderThreadImpl* current();
 117
 118   RenderThreadImpl();
 119   // Constructor that's used when running in single process mode.
 120   explicit RenderThreadImpl(const std::string& channel_name);
 121   virtual ~RenderThreadImpl();
 122   virtual void Shutdown() OVERRIDE;
 123
 124   // When initializing WebKit, ensure that any schemes needed for the content
 125   // module are registered properly.  Static to allow sharing with tests.
 126   static void RegisterSchemes();
 127
 128   // Notify V8 that the date/time configuration of the system might have
 129   // changed.
 130   static void NotifyTimezoneChange();
 131
 132   // RenderThread implementation:
 133   virtual bool Send(IPC::Message* msg) OVERRIDE;
 134   virtual base::MessageLoop* GetMessageLoop() OVERRIDE;
 135   virtual IPC::SyncChannel* GetChannel() OVERRIDE;
 136   virtual std::string GetLocale() OVERRIDE;
 137   virtual IPC::SyncMessageFilter* GetSyncMessageFilter() OVERRIDE;
 138   virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy()
 139       OVERRIDE;
 140   virtual void AddRoute(int32 routing_id, IPC::Listener* listener) OVERRIDE;
 141   virtual void RemoveRoute(int32 routing_id) OVERRIDE;
 142   virtual int GenerateRoutingID() OVERRIDE;
 143   virtual void AddFilter(IPC::MessageFilter* filter) OVERRIDE;
 144   virtual void RemoveFilter(IPC::MessageFilter* filter) OVERRIDE;
 145   virtual void AddObserver(RenderProcessObserver* observer) OVERRIDE;
 146   virtual void RemoveObserver(RenderProcessObserver* observer) OVERRIDE;
 147   virtual void SetResourceDispatcherDelegate(
 148       ResourceDispatcherDelegate* delegate) OVERRIDE;
 149   virtual void EnsureWebKitInitialized() OVERRIDE;
 150   virtual void RecordAction(const base::UserMetricsAction& action) OVERRIDE;
 151   virtual void RecordComputedAction(const std::string& action) OVERRIDE;
 152   virtual scoped_ptr<base::SharedMemory> HostAllocateSharedMemoryBuffer(
 153       size_t buffer_size) OVERRIDE;
 154   virtual void RegisterExtension(v8::Extension* extension) OVERRIDE;
 155   virtual void ScheduleIdleHandler(int64 initial_delay_ms) OVERRIDE;
 156   virtual void IdleHandler() OVERRIDE;
 157   virtual int64 GetIdleNotificationDelayInMs() const OVERRIDE;
 158   virtual void SetIdleNotificationDelayInMs(
 159       int64 idle_notification_delay_in_ms) OVERRIDE;
 160   virtual void UpdateHistograms(int sequence_number) OVERRIDE;
 161   virtual int PostTaskToAllWebWorkers(const base::Closure& closure) OVERRIDE;
 162   virtual bool ResolveProxy(const GURL& url, std::string* proxy_list) OVERRIDE;
 163   virtual base::WaitableEvent* GetShutdownEvent() OVERRIDE;
 164 #if defined(OS_WIN)
 165   virtual void PreCacheFont(const LOGFONT& log_font) OVERRIDE;
 166   virtual void ReleaseCachedFonts() OVERRIDE;
 167 #endif
 168
 169   // Synchronously establish a channel to the GPU plugin if not previously
 170   // established or if it has been lost (for example if the GPU plugin crashed).
 171   // If there is a pending asynchronous request, it will be completed by the
 172   // time this routine returns.
 173   GpuChannelHost* EstablishGpuChannelSync(CauseForGpuLaunch);
 174
 175
 176   // These methods modify how the next message is sent.  Normally, when sending
 177   // a synchronous message that runs a nested message loop, we need to suspend
 178   // callbacks into WebKit.  This involves disabling timers and deferring
 179   // resource loads.  However, there are exceptions when we need to customize
 180   // the behavior.
 181   void DoNotSuspendWebKitSharedTimer();
 182   void DoNotNotifyWebKitOfModalLoop();
 183
 184   // True if we are running layout tests. This currently disables forwarding
 185   // various status messages to the console, skips network error pages, and
 186   // short circuits size update and focus events.
 187   bool layout_test_mode() const {
 188     return layout_test_mode_;
 189   }
 190   void set_layout_test_mode(bool layout_test_mode) {
 191     layout_test_mode_ = layout_test_mode;
 192   }
 193
 194   IPC::ForwardingMessageFilter* compositor_output_surface_filter() const {
 195     return compositor_output_surface_filter_.get();
 196   }
 197
 198   InputHandlerManager* input_handler_manager() const {
 199     return input_handler_manager_.get();
 200   }
 201
 202   // Will be NULL if threaded compositing has not been enabled.
 203   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy() const {
 204     return compositor_message_loop_proxy_;
 205   }
 206
 207   bool is_gpu_rasterization_enabled() const {
 208     return is_gpu_rasterization_enabled_;
 209   }
 210
 211   bool is_gpu_rasterization_forced() const {
 212     return is_gpu_rasterization_forced_;
 213   }
 214
 215   bool is_impl_side_painting_enabled() const {
 216     return is_impl_side_painting_enabled_;
 217   }
 218
 219   bool is_low_res_tiling_enabled() const { return is_low_res_tiling_enabled_; }
 220
 221   bool is_lcd_text_enabled() const { return is_lcd_text_enabled_; }
 222
 223   bool is_distance_field_text_enabled() const {
 224     return is_distance_field_text_enabled_;
 225   }
 226
 227   bool is_zero_copy_enabled() const { return is_zero_copy_enabled_; }
 228
 229   bool is_one_copy_enabled() const { return is_one_copy_enabled_; }
 230
 231   AppCacheDispatcher* appcache_dispatcher() const {
 232     return appcache_dispatcher_.get();
 233   }
 234
 235   DomStorageDispatcher* dom_storage_dispatcher() const {
 236     return dom_storage_dispatcher_.get();
 237   }
 238
 239   EmbeddedWorkerDispatcher* embedded_worker_dispatcher() const {
 240     return embedded_worker_dispatcher_.get();
 241   }
 242
 243   AudioInputMessageFilter* audio_input_message_filter() {
 244     return audio_input_message_filter_.get();
 245   }
 246
 247   AudioMessageFilter* audio_message_filter() {
 248     return audio_message_filter_.get();
 249   }
 250
 251   MidiMessageFilter* midi_message_filter() {
 252     return midi_message_filter_.get();
 253   }
 254
 255 #if defined(OS_ANDROID)
 256   RendererDemuxerAndroid* renderer_demuxer() {
 257     return renderer_demuxer_.get();
 258   }
 259 #endif
 260
 261   // Creates the embedder implementation of WebMediaStreamCenter.
 262   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
 263   blink::WebMediaStreamCenter* CreateMediaStreamCenter(
 264       blink::WebMediaStreamCenterClient* client);
 265
 266   // Returns a factory used for creating RTC PeerConnection objects.
 267   PeerConnectionDependencyFactory* GetPeerConnectionDependencyFactory();
 268
 269   PeerConnectionTracker* peer_connection_tracker() {
 270     return peer_connection_tracker_.get();
 271   }
 272
 273   // Current P2PSocketDispatcher. Set to NULL if P2P API is disabled.
 274   P2PSocketDispatcher* p2p_socket_dispatcher() {
 275     return p2p_socket_dispatcher_.get();
 276   }
 277
 278   VideoCaptureImplManager* video_capture_impl_manager() const {
 279     return vc_manager_.get();
 280   }
 281
 282   GamepadSharedMemoryReader* gamepad_shared_memory_reader() const {
 283     return gamepad_shared_memory_reader_.get();
 284   }
 285
 286   // Get the GPU channel. Returns NULL if the channel is not established or
 287   // has been lost.
 288   GpuChannelHost* GetGpuChannel();
 289
 290   // Returns a MessageLoopProxy instance corresponding to the message loop
 291   // of the thread on which file operations should be run. Must be called
 292   // on the renderer's main thread.
 293   scoped_refptr<base::MessageLoopProxy> GetFileThreadMessageLoopProxy();
 294
 295   // Returns a MessageLoopProxy instance corresponding to the message loop
 296   // of the thread on which media operations should be run. Must be called
 297   // on the renderer's main thread.
 298   scoped_refptr<base::MessageLoopProxy> GetMediaThreadMessageLoopProxy();
 299
 300   // Causes the idle handler to skip sending idle notifications
 301   // on the two next scheduled calls, so idle notifications are
 302   // not sent for at least one notification delay.
 303   void PostponeIdleNotification();
 304
 305   scoped_refptr<media::GpuVideoAcceleratorFactories> GetGpuFactories();
 306
 307   scoped_refptr<webkit::gpu::ContextProviderWebContext>
 308       SharedMainThreadContextProvider();
 309
 310   // AudioRendererMixerManager instance which manages renderer side mixer
 311   // instances shared based on configured audio parameters.  Lazily created on
 312   // first call.
 313   AudioRendererMixerManager* GetAudioRendererMixerManager();
 314
 315   // AudioHardwareConfig contains audio hardware configuration for
 316   // renderer side clients.  Creation requires a synchronous IPC call so it is
 317   // lazily created on the first call.
 318   media::AudioHardwareConfig* GetAudioHardwareConfig();
 319
 320 #if defined(OS_WIN)
 321   void PreCacheFontCharacters(const LOGFONT& log_font,
 322                               const base::string16& str);
 323 #endif
 324
 325 #if defined(ENABLE_WEBRTC)
 326   WebRTCIdentityService* get_webrtc_identity_service() {
 327     return webrtc_identity_service_.get();
 328   }
 329 #endif
 330
 331   // For producing custom V8 histograms. Custom histograms are produced if all
 332   // RenderViews share the same host, and the host is in the pre-specified set
 333   // of hosts we want to produce custom diagrams for. The name for a custom
 334   // diagram is the name of the corresponding generic diagram plus a
 335   // host-specific suffix.
 336   class CONTENT_EXPORT HistogramCustomizer {
 337    public:
 338     HistogramCustomizer();
 339     ~HistogramCustomizer();
 340
 341     // Called when a top frame of a RenderView navigates. This function updates
 342     // RenderThreadImpl's information about whether all RenderViews are
 343     // displaying a page from the same host. |host| is the host where a
 344     // RenderView navigated, and |view_count| is the number of RenderViews in
 345     // this process.
 346     void RenderViewNavigatedToHost(const std::string& host, size_t view_count);
 347
 348     // Used for customizing some histograms if all RenderViews share the same
 349     // host. Returns the current custom histogram name to use for
 350     // |histogram_name|, or |histogram_name| if it shouldn't be customized.
 351     std::string ConvertToCustomHistogramName(const char* histogram_name) const;
 352
 353    private:
 354     friend class RenderThreadImplUnittest;
 355
 356     // Used for updating the information on which is the common host which all
 357     // RenderView's share (if any). If there is no common host, this function is
 358     // called with an empty string.
 359     void SetCommonHost(const std::string& host);
 360
 361     // The current common host of the RenderViews; empty string if there is no
 362     // common host.
 363     std::string common_host_;
 364     // The corresponding suffix.
 365     std::string common_host_histogram_suffix_;
 366     // Set of histograms for which we want to produce a custom histogram if
 367     // possible.
 368     std::set<std::string> custom_histograms_;
 369
 370     DISALLOW_COPY_AND_ASSIGN(HistogramCustomizer);
 371   };
 372
 373   HistogramCustomizer* histogram_customizer() {
 374     return &histogram_customizer_;
 375   }
 376
 377   void SetFlingCurveParameters(const std::vector<float>& new_touchpad,
 378                                const std::vector<float>& new_touchscreen);
 379
 380   // Retrieve current gamepad data.
 381   void SampleGamepads(blink::WebGamepads* data);
 382
 383   // Set a listener for gamepad connected/disconnected events.
 384   // A non-null listener must be set first before calling SampleGamepads.
 385   void SetGamepadListener(blink::WebGamepadListener* listener);
 386
 387   // Called by a RenderWidget when it is created or destroyed. This
 388   // allows the process to know when there are no visible widgets.
 389   void WidgetCreated();
 390   void WidgetDestroyed();
 391   void WidgetHidden();
 392   void WidgetRestored();
 393
 394   void AddEmbeddedWorkerRoute(int32 routing_id, IPC::Listener* listener);
 395   void RemoveEmbeddedWorkerRoute(int32 routing_id);
 396
 397  private:
 398   // ChildThread
 399   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;
 400
 401   // GpuChannelHostFactory implementation:
 402   virtual bool IsMainThread() OVERRIDE;
 403   virtual base::MessageLoop* GetMainLoop() OVERRIDE;
 404   virtual scoped_refptr<base::MessageLoopProxy> GetIOLoopProxy() OVERRIDE;
 405   virtual scoped_ptr<base::SharedMemory> AllocateSharedMemory(
 406       size_t size) OVERRIDE;
 407   virtual bool CreateViewCommandBuffer(
 408       int32 surface_id,
 409       const GPUCreateCommandBufferConfig& init_params,
 410       int32 route_id) OVERRIDE;
 411   virtual void CreateImage(
 412       gfx::PluginWindowHandle window,
 413       int32 image_id,
 414       const CreateImageCallback& callback) OVERRIDE;
 415   virtual void DeleteImage(int32 image_id, int32 sync_point) OVERRIDE;
 416   virtual scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
 417       size_t width,
 418       size_t height,
 419       unsigned internalformat,
 420       unsigned usage) OVERRIDE;
 421
 422   // mojo::ServiceProvider implementation:
 423   virtual void ConnectToService(
 424       const mojo::String& service_url,
 425       const mojo::String& service_name,
 426       mojo::ScopedMessagePipeHandle message_pipe,
 427       const mojo::String& requestor_url) OVERRIDE;
 428
 429   void Init();
 430
 431   void OnSetZoomLevelForCurrentURL(const std::string& scheme,
 432                                    const std::string& host,
 433                                    double zoom_level);
 434   void OnCreateNewView(const ViewMsg_New_Params& params);
 435   void OnTransferBitmap(const SkBitmap& bitmap, int resource_id);
 436   void OnPurgePluginListCache(bool reload_pages);
 437   void OnNetworkTypeChanged(net::NetworkChangeNotifier::ConnectionType type);
 438   void OnGetAccessibilityTree();
 439   void OnTempCrashWithData(const GURL& data);
 440   void OnUpdateTimezone();
 441   void OnMemoryPressure(
 442       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 443 #if defined(OS_ANDROID)
 444   void OnSetWebKitSharedTimersSuspended(bool suspend);
 445 #endif
 446 #if defined(OS_MACOSX)
 447   void OnUpdateScrollbarTheme(float initial_button_delay,
 448                               float autoscroll_button_delay,
 449                               bool jump_on_track_click,
 450                               blink::ScrollerStyle preferred_scroller_style,
 451                               bool redraw);
 452 #endif
 453   void OnCreateNewSharedWorker(
 454       const WorkerProcessMsg_CreateWorker_Params& params);
 455
 456   void IdleHandlerInForegroundTab();
 457
 458   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateOffscreenContext3d();
 459
 460   // These objects live solely on the render thread.
 461   scoped_ptr<AppCacheDispatcher> appcache_dispatcher_;
 462   scoped_ptr<DomStorageDispatcher> dom_storage_dispatcher_;
 463   scoped_ptr<IndexedDBDispatcher> main_thread_indexed_db_dispatcher_;
 464   scoped_ptr<RendererWebKitPlatformSupportImpl> webkit_platform_support_;
 465   scoped_ptr<EmbeddedWorkerDispatcher> embedded_worker_dispatcher_;
 466
 467   // Used on the render thread and deleted by WebKit at shutdown.
 468   blink::WebMediaStreamCenter* media_stream_center_;
 469
 470   // Used on the renderer and IPC threads.
 471   scoped_refptr<DBMessageFilter> db_message_filter_;
 472   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
 473   scoped_refptr<AudioMessageFilter> audio_message_filter_;
 474   scoped_refptr<MidiMessageFilter> midi_message_filter_;
 475 #if defined(OS_ANDROID)
 476   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
 477 #endif
 478   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
 479
 480   scoped_ptr<PeerConnectionDependencyFactory> peer_connection_factory_;
 481
 482   // This is used to communicate to the browser process the status
 483   // of all the peer connections created in the renderer.
 484   scoped_ptr<PeerConnectionTracker> peer_connection_tracker_;
 485
 486   // Dispatches all P2P sockets.
 487   scoped_refptr<P2PSocketDispatcher> p2p_socket_dispatcher_;
 488
 489   // Used on the render thread.
 490   scoped_ptr<VideoCaptureImplManager> vc_manager_;
 491
 492   // The count of RenderWidgets running through this thread.
 493   int widget_count_;
 494
 495   // The count of hidden RenderWidgets running through this thread.
 496   int hidden_widget_count_;
 497
 498   // The current value of the idle notification timer delay.
 499   int64 idle_notification_delay_in_ms_;
 500
 501   // The number of idle handler calls that skip sending idle notifications.
 502   int idle_notifications_to_skip_;
 503
 504   bool suspend_webkit_shared_timer_;
 505   bool notify_webkit_of_modal_loop_;
 506   bool webkit_shared_timer_suspended_;
 507
 508   // The following flag is used to control layout test specific behavior.
 509   bool layout_test_mode_;
 510
 511   // Timer that periodically calls IdleHandler.
 512   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
 513
 514   // The channel from the renderer process to the GPU process.
 515   scoped_refptr<GpuChannelHost> gpu_channel_;
 516
 517   // Cache of variables that are needed on the compositor thread by
 518   // GpuChannelHostFactory methods.
 519   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 520
 521   // A lazily initiated thread on which file operations are run.
 522   scoped_ptr<base::Thread> file_thread_;
 523
 524   // May be null if overridden by ContentRendererClient.
 525   scoped_ptr<base::Thread> compositor_thread_;
 526
 527   // Thread for running multimedia operations (e.g., video decoding).
 528   scoped_ptr<base::Thread> media_thread_;
 529
 530   // Will point to appropriate MessageLoopProxy after initialization,
 531   // regardless of whether |compositor_thread_| is overriden.
 532   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy_;
 533
 534   // May be null if unused by the |input_handler_manager_|.
 535   scoped_refptr<InputEventFilter> input_event_filter_;
 536   scoped_ptr<InputHandlerManager> input_handler_manager_;
 537   scoped_refptr<IPC::ForwardingMessageFilter> compositor_output_surface_filter_;
 538
 539   scoped_refptr<ContextProviderCommandBuffer> shared_main_thread_contexts_;
 540
 541   ObserverList<RenderProcessObserver> observers_;
 542
 543   scoped_refptr<ContextProviderCommandBuffer> gpu_va_context_provider_;
 544
 545   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
 546   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
 547
 548   HistogramCustomizer histogram_customizer_;
 549
 550   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 551
 552   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 553
 554   scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
 555
 556   // TODO(reveman): Allow AllocateGpuMemoryBuffer to be called from
 557   // multiple threads. Current allocation mechanism for IOSurface
 558   // backed GpuMemoryBuffers prevent this. crbug.com/325045
 559   base::ThreadChecker allocate_gpu_memory_buffer_thread_checker_;
 560
 561   // Compositor settings
 562   bool is_gpu_rasterization_enabled_;
 563   bool is_gpu_rasterization_forced_;
 564   bool is_impl_side_painting_enabled_;
 565   bool is_low_res_tiling_enabled_;
 566   bool is_lcd_text_enabled_;
 567   bool is_distance_field_text_enabled_;
 568   bool is_zero_copy_enabled_;
 569   bool is_one_copy_enabled_;
 570
 571   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 572 };
 573
 574 }  // namespace content
 575
 576 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_